Constructional element



Dec. 20, 1938. K w. MAUSER CONSTRUCTIONAL ELEMENT Filed Feb. 27, 1936 I//V vs an 5 a g 7 [ff KIA/.Wusef' Patented 20, 1938 UNITED STATESPATENT- OFFICE Karl Wilhelm Mauser, Colognc-Ehrenfeld, Germany,assignor, :by mcsne assignme to to Mauser Kommandit Ehrenfeld, GermanyGes ellschaft, Col he- Application February 27,- 1936, Serial No.66,101. In Germany Februal-r28, 1935 .4 Claims. (Cl. 18934) Thisinvention relates to constructional elements of metal for enclosingrooms, 'ships cabins and the like, which are formed from two or moremetal plates held at distances apart and com- 5- pletely insulated fromone another. Constructional elements are already known in which themetal plates are insulated from one another by solid insulating plateswhich are interposed. Suchinsulating plates are mostly made of cork,

l asbestos or the like, and have not suflicient strength to give theconstructional element the desired stability. It was therefore foundnecessary to make the metal plates thicker. Apart from the high initialcost, this, in addition to the 15 solid construction of the insulatinglayer, led to an increase of the weight, which is undesirable,especially in ship construction. Finally, metal webs have been used forconnecting the metal plates of the constructional element which serve 20at the same time for re-inforcement and make it possible to diminish thethickness of the walls to a minimum. This results in a diminution of theweight, but the two outer metal plates are not thermally insulated fromone another, because 25 the connecting webs act as conductors of heat.

Furthermore, the webs act as carriers of sound so that the insulatingmaterial enclosed in the hollow spaces becomes inefiective. Thesimultaneous connection of the webs with the metal plates 30 leads togreat diftlculties, as, in order to avoid external projections, they canonly be connected by spot welding. This may be effected by inserting aconducting core between the limbs of the web. Such manipulation,however, is very as complicated and expensive. In order to obtaininsulation of the outer metal plates of the element, insulat-ng layershave been inserted between the lim oi the connecting webs and the metalplates. In that case spot welding cannot 40 be used and counter-sunkscrews have to be used for connecting, because, in view of the desiredstability and portability of the element, the metal plates have tobe-securely connected together. The screw connection, however, is notonly very complicated, but also it causes a great increase in theinitial cost. There is no certainty of the applied on one side of theconstructional element 58 it does not have any result at the other side.

.being forced in.

tional element in a simple manner is facilitated. a

It is advisable to make the rails from two metal strips corresponding inshape to the guides, which encloses the solid insulating core to such anextent that a sufllcient'distance remains between the metal strips toensure complete insulation. 'I'he securing of the dove-tail or step-likeguides to the metal plates by spot-welding can be effected withouttrouble in a simple and cheap manner.

Furthermore, according to the invention it is proposed to use asinsulating material corrugated card made from asbestosor the like. Whensuitably used this has a. high strength and is suitable for suflicientlyprotecting the metal plates against The constructional elements aresufllciently strong, even when the walls are thin, and the stability canbe increased by providing a suitable number of connecting rails. Thecorrugated insulating card has the advantage over the solid insulatinglayers of being considerably less in weight. Theassembly is effectedaccording to the course of the corrugations in such a manner thatseparate plates or strips are formed which are covered by plane cardlayers. The sound and heat insulation can be increased to a great extentby providing a suitable number of card layers, that is by dividing thecorrugated material into layers.

The invention will be more fully described with reference to theaccompanying drawing.

,Flg. 1 is an elevation and Fig. 2 a cross-section of a constructionalelement.

Fig. 3 is a cross-section of a part of an element on a larger scale.

Figs. 4, 5 and 6 are cross-sectional views of modified constructions.

Figure 2 shows a cross-section through a constructional elementconsisting of two metal plates a and b. For connecting them together'theplates have" on the inside dove-tail shaped guides d in betweenwhich theconnecting rails c of solid insulating material are slidably guided soas l to be easily removableif and when required. At

the places where the elements are joined together the guides d servealso as abutments for the insulating insertions p used for connectingthe two elements together. The hollow space remaining between the metalplates a, b is filled with corrugated card made of asbestos or thesulating core 0 is partly enclosed by two metal strips g which slide onthe plates 0., b and in the guides d. The sliding in and out of therails c is greatly facilitated by the arrangement of the metal strips 9.An essential feature, however, is the increased stability of theconnection and therefore of the constructional element obtained thereby.As is clear from Figure 3 the connection of the two metal strips g canbe secured by means of a screw and threaded sleeve k, the heads I ofwhich fit in depressions m of the metal plates 0, b which are fitted ininsulating sleeves i. The screw heads are insulated from'the metalplates a, b by means of small insulating plates n applied so as toadhere, which may be arranged to spring back with respect to the outeredges of the rail, so as not to form an obstruction to the greatercertainty. The guiding strips g in this.

case are made in pairs from a metal strip and are thus connected withthe metal plates a or b.

Figure 5 illustrates a constructional form of the connection of themetal plates a, b, in which the metal strips g are simply bent back atright angles and engage in step-like guides f secured to the metalplates.

In the modified form of the invention shown in Figure 6, the distancingbars are so constructed that a space is left between the holders and themetal plates. When they are slid in, the abutting ecges of the holdersslide on the metal plate guides, so that the frictional resistance isreduced to a minimum. This construction has a further advantage, in thatthe insulation of the outer metal plates with respect to one another isconsiderably improved, more particularly y the air cushion in theintermediate space 1.

The metal plates a and b areprovided on the inner side with guides f.Between the plates is the compact filling of material It. The distancingbar consists oi" the compact insulating mass 0 which is enclosed ontwosides by the independent holders 0?. The latter are" connectedtogether by the screws 1. The'insulation of the screws 1' with respectto the holders 0' is eflected by means of insulating discs L- 'Iheholders W have at the ends bent-overpartsr so that they only bearagainst the guides I with" the thickness of the material. Air. spaces'qare left between the metal plates a and b and the distancing bars a, c.

It is of advantage for the stability of the-con structional element forthe rafls c to be made to pass right through, so that a smooth bearingsurface for the plates a, b is ensured. Instead of the rails it would bepossible also to use separate short connecting pieces in order to obtaina better insertion of the insulating plates h of corrugated card, or toobtain a further diminution of weight and saving of material. The methodof using thecorrugatd insulating material is shown in the variousfigures. Thus the cut away part in Figures 1, 2 and 3 show the ar-'rangement of the corrugations transverse to the metal plates a, b inwhich position the corrugated material offers the greatest resistance tolateral pressure on the metal plates. This arrangement will thereforeprincipally be used for filling of the connecting rails 0. Figures 4 and5 show the arrangement of the corrugations along the connecting rails,the layers running transverse to the metal plates a, b, in Figure 4, andparallel thereto in Fig: 5. The layers of corrugated material are heldtogether in separate plates or strips by means of the outer plane coverso. For increasing the sound and heat insulation it is possible to insertseveral plane insulating layers 0 as shown in Fig. 2. The eii'ectivenessof such insulation against heat has been tested experimentally in theconstruction of the element according to the invention. Thus, forexample, when the metal plate a was exposed to a temperature of about500 0.. even after a long time a temperature of only 32 C. was measuredat the plate b.

What I claim is:-

1. A sound and heat insulating constructional element consisting of aplurality of spaced metal plates, rails for connecting and spacing themetal plates, each consisting of corrugated asbestos material and twosheet metal strips partly enclosing the corrugated asbestos material,and guides, shaped to flt the sheet metal strips, be-

tween which the rails can slide, arranged on the inner sides of themetal plates.

2. A sound andheat insulating constructional element consisting of aplurality of spaced metal plates, rails for connecting and spacing themeg] plates, each consisting of compact insulating material and twosheet metal strips partly enclosing the insulating material, a screw anda threaded sleeve for each rail for securing the metal strips together,the metal strips having depressions for receiving the heads of the screwand sleeve, and insulating linings for the depressions and insulatingplates for covering the heads of the screw and sleeve, and guides,shaped to fit the sheet metal strips, between which the rails can slide,arranged on the inner sides 0! the metal plates.

1 3. A sound and heat insulatinz constructional plates rails ofcorrugated asbestos material for element consisting of a plurality ofspaced metal. to

connecting and spacing the metal plates, and

guides "shaped to flt the rails, between which the slide, arranged onthe inner sides of the metalplates.

4. A constructional element as claimed in claiml. in'which thecorrugated asbestos material is laminated.

